diff --git a/internal/repository/holiday_repository.go b/internal/repository/holiday_repository.go
index 1b4f596..de511a8 100644
--- a/internal/repository/holiday_repository.go
+++ b/internal/repository/holiday_repository.go
@@ -90,17 +90,17 @@ func (r *holidayRepository) GetAll(filter models.HolidayFilter) ([]models.Holida
 
 	if filter.Year != nil {
 		whereConditions = append(whereConditions, "strftime('%Y', date) = ?")
-		args = append(args, strconv.Itoa(*filter.Year))
+		args = append(args, fmt.Sprintf("%d", *filter.Year))
 	}
 
 	if filter.Month != nil {
 		whereConditions = append(whereConditions, "strftime('%m', date) = ?")
-		args = append(args, strconv.Itoa(*filter.Month))
+		args = append(args, fmt.Sprintf("%02d", *filter.Month))
 	}
 
 	if filter.Day != nil {
 		whereConditions = append(whereConditions, "strftime('%d', date) = ?")
-		args = append(args, strconv.Itoa(*filter.Day))
+		args = append(args, fmt.Sprintf("%02d", *filter.Day))
 	}
 
 	if filter.Type != nil {
diff --git a/pkg/client/client.go b/pkg/client/client.go
index 4119d28..1eaf023 100644
--- a/pkg/client/client.go
+++ b/pkg/client/client.go
@@ -6,7 +6,6 @@ import (
 	"encoding/json"
 	"fmt"
 	"net/http"
-	"strconv"
 	"time"
 )
 
@@ -102,10 +101,10 @@ func (c *Client) GetHolidays(ctx context.Context, year, month *int, holidayType
 
 	q := req.URL.Query()
 	if year != nil {
-		q.Add("year", strconv.Itoa(*year))
+		q.Add("year", fmt.Sprintf("%d", *year))
 	}
 	if month != nil {
-		q.Add("month", strconv.Itoa(*month))
+		q.Add("month", fmt.Sprintf("%d", *month))
 	}
 	if holidayType != "" {
 		q.Add("type", holidayType)